How can I upload HTML files to project asset?

I am developing an app where I like to show HTML files (more than 500 files) and want to keep it inside the app (which means not fetching it from the database but fetch it from local storage). However, I can't upload the HTML files into the project asset.

If I tried to show the HTML file in a single custom function, then I would need 500 custom functions which is tedious!

So, I am seeking the help of the community.

Thanks